C++ Log日志类轻量级支持格式化输出变量实现代码

 #ifndef __CLOG__ #define __CLOG__ #include  #include  #include  #include  #include  class CLog { public: CLog(); CLog(const std::string LogFile); ~CLog(); template  static void WriteLog(T x); //支持格式化输出多参数输出 static void WriteLogFormat(const char* format, ...); private: static std::string GetFilePath(); std::string m_LogFilePath; static std::string GetSystemTimes(); static bool IsPathExist(const std::string FilePath); }; //支持输出int double 文本 template  void CLog::WriteLog(T x) { std::fstream of(GetFilePath(), std::ios::app); if (!of.is_open())return; of.seekp(std::ios::end);  //设置文件指针到文件尾部 of << GetSystemTimes() <<_T("line: ")<<__LINE__<<_T(" value: ")<< x << std::endl; of.close();  //关闭文件； } #endif

 #include "Log.h" CLog::CLog() :m_LogFilePath("") { m_LogFilePath = GetFilePath(); if (IsPathExist(m_LogFilePath)) DeleteFile(m_LogFilePath.c_str()); } CLog::CLog(const std::string LogFile) :m_LogFilePath(LogFile) { if (IsPathExist(m_LogFilePath)) DeleteFile(m_LogFilePath.c_str()); } CLog::~CLog() { } void CLog::WriteLogFormat(const char* format, ...) { va_list arglist; std::string strArgData; char szBuffer[0x1024]; ZeroMemory(szBuffer, 0x1024); va_start(arglist, format); vsprintf_s(szBuffer, format, arglist); va_end(arglist); strArgData = szBuffer; std::fstream of(GetFilePath(), std::ios::app); if (!of.is_open())return; of << GetSystemTimes() << " Line: " << __LINE__ << " Value: " << strArgData << std::endl; of.close(); } std::string CLog::GetFilePath() { std::string FlieTmp; TCHAR szPath[MAX_PATH]; ::ZeroMemory(szPath, MAX_PATH); if (!::GetCurrentDirectory(MAX_PATH, szPath))return FlieTmp; FlieTmp = szPath; FlieTmp += _T("\\log.txt"); return FlieTmp; } std::string CLog::GetSystemTimes() { time_t Time; CHAR strTime[MAX_PATH]; ZeroMemory(strTime, MAX_PATH); time(&Time); tm t; localtime_s(&t, &Time); strftime(strTime, 100, _T("%Y-%m-%d %H:%M:%S "), &t); std::string strTimes = strTime; return strTimes; } bool CLog::IsPathExist(const std::string FilePath) { DWORD dwAttribute = ::GetFileAttributes(FilePath.c_str()); return dwAttribute != INVALID_FILE_ATTRIBUTES; }